Shelf assembly



FIG. 1 is a perspective view showing the top, front and right side of the shelf assembly of my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The vertical surface on which the shelf assembly is depicted as being mounted, is shown in dotted lines and forms no part of the claimed design. 

CLAIM The ornamental design for a shelf assembly, as shown and described. 